Yes, we are able to do it via the hapikey. Not so much deprecated, but isn't an optimal solution, as only professional and enterprise users have access to hapikey. Email API for instance also seems to only support the hapikey and not oAuth. I mean, the Email API for creating an email, not the one listed in the help docs.

I don't get an error. I get a response 200, the following header and no response body{'Date': 'Wed, 22 Mar 2017 21:57:35 GMT', 'Content-Length': '0', 'Connection': 'keep-alive', 'Access-Control-Allow-Credentials': 'false'}At this stage all I am sending is this JSON{ "name": "My first API blog post","content_group_id": 4308079277 }to this URL: https://api.hubapi.com/content/api/v2/blog-posts?hapikey=xxx-xx-xx-xx